Disinfect your bathroom and anything else she came in contact with....door knobs, dishware, drinking glass, table top, etc.
Coming in contact with her vomit, feces, saliva, or bodily secretions could pass along any GI pathogen. It sounds like a gastrointestinal infection to me. I hope her fetus is all right and your family.
Also wash hands frequently.
Change your kitchen sponge or wash cloth too.
If your six month old is on solids or drinks from a cup, sample it all so...